Isis may be printing authentic-looking Syrian passports.

An aerial image taken by Russian warplanes shows an Isis oil depot moments before it was bombed by Russia.Russian MOD

Isis oil going to Assad, Turkey: US Treasury Department official Adam Szubin said the Islamic State (Isis) was selling much of its oil to Syrian President Bashar al-Assad, while some was also reaching Turkey.

The US statement that some amount of Isis oil, the terror group's chief source of income, was going to Turkey from its border with Syria comes after Russia accused Turkish President Tayyip Erdogan and his family of being involved in oil trade with Daesh.

The agency said in its intelligence report Isis may be using the passport-printing machines to make fake passports that may have helped its fighters and supporters enter the United States.

"Since more than 17 months [have] passed since Raqqa and Deir ez-Zour fell to ISIS, it is possible that individuals from Syria with passports 'issued' in these Isis-controlled cities or who had passport blanks, may have travelled to the US," the HSI Intelligence Report says, according to ABC News.

Foreign woman kills four in Afghansitan: A suicide attack by a foreign woman left four people — an intelligence official and three children — dead in Afghanistan's Nangarhar province on Thursday.

The attack occurred when members of the National Directorate of Security (NDS), the Afghan intelligence agency, carried out checks on a group of foreigners travelling in a car, according to Khaama Press.

One of the NDS officials was killed after a foreign woman detonated her suicide vest. The nationality of the woman was not clear.

Isis finance chief Abu Saleh killed in airstrike: Abu Saleh, said to be the "finance minister" of the Islamic State, was killed in an airstrike last month, said US officials.

Saleh, whose real name was Muwaffaq Mustafa Muhammad al-Karmush, was said to have managed the terror group's financial network and was "one of the most senior and experienced members", US military spokesman Colonel Steve Warren reportedly said.